Progress. I installed Socket in local lib. I had to do this to load it:

#!/usr/bin/perl

BEGIN { unshift @INC, "/home/neil/perl5/lib/perl5" }
BEGIN { unshift @INC, "/home/neil/perl5/lib/perl5/x86_64-linux-thread-
+multi" }

use strict;
use warnings;
use Socket qw ( getnameinfo getaddrinfo );
[download]

If there is a better way I'm all ears. I know I can set a shell environment but, I'm not inclined to trust that once the program is shipped out.